Smoke billows up from APA attacked by submarine off the coast of Kwajalein during tests conducted by the United States.

U.S. ships being attacked by submarines underway off the coast of Kwajalein, Marshall Islands during army tests conducted by the United States. Aerial view of U.S. APA (attack transport) underway and being attacked by submarine. Several views of smoke billowing up from explosion. APA sinks after being attacked.